SQL provides different types of indexes for different performance requirements.
Each index type is optimized for specific use cases.
Choosing the correct index is important.
The most common index type is B-Tree index.
It is used for equality and range searches.
Most databases use B-Tree by default.
Unique indexes ensure all indexed values are unique.
They also improve search performance.
Primary key automatically creates a unique index.
Other index types include FULLTEXT and HASH indexes.
FULLTEXT is used for text searching.
HASH is used for exact match lookups.
Different index types serve different purposes.
Understanding index types improves optimization.
Wrong index choice can reduce performance.